releases: update patch release to August cycle

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

data/releases/schedule.yaml

@@ -1,10 +1,13 @@
 schedules:
 - release: 1.21
-  next: 1.21.3
-  cherryPickDeadline: 2021-07-10
-  targetDate: 2021-07-14
+  next: 1.21.4
+  cherryPickDeadline: 2021-08-07
+  targetDate: 2021-08-11
   endOfLifeDate: 2022-04-30
   previousPatches:
+    - release: 1.21.3
+      cherryPickDeadline: 2021-07-10
+      targetDate: 2021-07-14
     - release: 1.21.2
       cherryPickDeadline: 2021-06-12
       targetDate: 2021-06-16
@@ -13,11 +16,14 @@ schedules:
       targetDate: 2021-05-12
       note: Regression https://groups.google.com/g/kubernetes-dev/c/KuF8s2zueFs
 - release: 1.20
-  next: 1.20.9
-  cherryPickDeadline: 2021-07-10
-  targetDate: 2021-07-14
+  next: 1.20.10
+  cherryPickDeadline: 2021-08-07
+  targetDate: 2021-08-11
   endOfLifeDate: 2021-12-30
   previousPatches:
+    - release: 1.20.9
+      cherryPickDeadline: 2021-07-10
+      targetDate: 2021-07-14
     - release: 1.20.8
       cherryPickDeadline: 2021-06-12
       targetDate: 2021-06-16
@@ -46,11 +52,14 @@ schedules:
       targetDate: 2020-12-18
       note: "Tagging Issue https://groups.google.com/g/kubernetes-dev/c/dNH2yknlCBA"
 - release: 1.19
-  next: 1.19.13
-  cherryPickDeadline: 2021-07-10
-  targetDate: 2021-07-14
+  next: 1.19.14
+  cherryPickDeadline: 2021-08-07
+  targetDate: 2021-08-11
   endOfLifeDate: 2021-09-30
   previousPatches:
+    - release: 1.19.13
+      cherryPickDeadline: 2021-07-10
+      targetDate: 2021-07-14
     - release: 1.19.12
       cherryPickDeadline: 2021-06-12
       targetDate: 2021-06-16